Create sso user api (#886)

* facilitate linking/unlinking existing users from an sso enabled org

* added user_identifier to identity methods for sso

* moved sso user delete method to account controller

* fixed a broken test

* Update AccountsController.cs

* facilitate linking/unlinking existing users from an sso enabled org

* added user_identifier to identity methods for sso

* moved sso user delete method to account controller

* fixed a broken test

* added a token to the existing user sso link flow

* added a token to the existing user sso link flow

* fixed a typo

* added an event log for unlink ssoUser records

* fixed a merge issue

* fixed a busted test

* fixed a busted test

* ran a formatter over everything & changed .vscode settings in .gitignore

* chagned a variable to use string interpolation

* removed a blank line

* Changed TokenPurpose enum to a static class of strings

* code review cleanups

* formatting fix

* Changed parameters & logging for delete sso user

* changed th method used to get organization user for deleting sso user records

Co-authored-by: Kyle Spearrin <kspearrin@users.noreply.github.com>

.gitignore

@@ -206,4 +206,6 @@ src/Core/Properties/launchSettings.json
 *.override.env
 **/*.DS_Store
 src/Admin/wwwroot/lib
-src/Admin/wwwroot/css
+src/Admin/wwwroot/css
+.vscode/*
+**/.vscode/*